<!DOCTYPE html>
<html lang="zh-Hans">
<head>
  <meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<meta name="theme-color" content="#222"><meta name="generator" content="Hexo 6.2.0">


  <link rel="apple-touch-icon" sizes="180x180" href="/vhuichen.ico">
  <link rel="icon" type="image/png" sizes="32x32" href="/vhuichen.ico">
  <link rel="icon" type="image/png" sizes="16x16" href="/vhuichen.ico">
  <link rel="mask-icon" href="/vhuichen.ico" color="#222">

<link rel="stylesheet" href="/css/main.css">



<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.0/css/all.min.css" integrity="sha256-AbA177XfpSnFEvgpYu1jMygiLabzPCJCRIBtR5jGc0k=" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.1.1/animate.min.css" integrity="sha256-PR7ttpcvz8qrF57fur/yAx1qXMFJeJFiA6pSzWi0OIE=" crossorigin="anonymous">

<script class="next-config" data-name="main" type="application/json">{"hostname":"vhuichen.github.io","root":"/","images":"/images","scheme":"Pisces","darkmode":false,"version":"8.13.0","exturl":false,"sidebar":{"position":"left","display":"display","padding":18,"offset":12},"copycode":{"enable":false,"style":null},"bookmark":{"enable":false,"color":"#222","save":"auto"},"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"stickytabs":false,"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"Searching...","empty":"We didn't find any results for the search: ${query}","hits_time":"${hits} results found in ${time} ms","hits":"${hits} results found"}}</script><script src="/js/config.js"></script>

    <meta name="description" content="判断View是否显示在当前窗口写一个分类 1234567#import &lt;UIKit&#x2F;UIKit.h&gt;@interface UIView (VCHFrame)- (BOOL)isShowingOnKeyWindow;@end  12345678910111213141516- (BOOL)isShowingOnKeyWindow &amp;#123;    UIWindow *window &#x3D;">
<meta property="og:type" content="article">
<meta property="og:title" content="iOS开发之判断View是否显示在当前窗口">
<meta property="og:url" content="https://vhuichen.github.io/2017/07/2017/07/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E5%88%A4%E6%96%ADView%E6%98%AF%E5%90%A6%E6%98%BE%E7%A4%BA%E5%9C%A8%E5%BD%93%E5%89%8D%E7%AA%97%E5%8F%A3/index.html">
<meta property="og:site_name" content="vhuichen">
<meta property="og:description" content="判断View是否显示在当前窗口写一个分类 1234567#import &lt;UIKit&#x2F;UIKit.h&gt;@interface UIView (VCHFrame)- (BOOL)isShowingOnKeyWindow;@end  12345678910111213141516- (BOOL)isShowingOnKeyWindow &amp;#123;    UIWindow *window &#x3D;">
<meta property="og:locale">
<meta property="article:published_time" content="2017-07-11T13:01:43.000Z">
<meta property="article:modified_time" content="2018-07-01T08:07:46.980Z">
<meta property="article:author" content="vhuichen">
<meta property="article:tag" content="View">
<meta name="twitter:card" content="summary">


<link rel="canonical" href="https://vhuichen.github.io/2017/07/2017/07/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E5%88%A4%E6%96%ADView%E6%98%AF%E5%90%A6%E6%98%BE%E7%A4%BA%E5%9C%A8%E5%BD%93%E5%89%8D%E7%AA%97%E5%8F%A3/">



<script class="next-config" data-name="page" type="application/json">{"sidebar":"","isHome":false,"isPost":true,"lang":"zh-Hans","comments":true,"permalink":"https://vhuichen.github.io/2017/07/2017/07/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E5%88%A4%E6%96%ADView%E6%98%AF%E5%90%A6%E6%98%BE%E7%A4%BA%E5%9C%A8%E5%BD%93%E5%89%8D%E7%AA%97%E5%8F%A3/","path":"2017/07/2017/07/iOS开发之判断View是否显示在当前窗口/","title":"iOS开发之判断View是否显示在当前窗口"}</script>

<script class="next-config" data-name="calendar" type="application/json">""</script>
<title>iOS开发之判断View是否显示在当前窗口 | vhuichen</title>
  






  <noscript>
    <link rel="stylesheet" href="/css/noscript.css">
  </noscript>
</head>

<body itemscope itemtype="http://schema.org/WebPage" class="use-motion">
  <div class="headband"></div>

  <main class="main">
    <header class="header" itemscope itemtype="http://schema.org/WPHeader">
      <div class="header-inner"><div class="site-brand-container">
  <div class="site-nav-toggle">
    <div class="toggle" aria-label="Toggle navigation bar" role="button">
        <span class="toggle-line"></span>
        <span class="toggle-line"></span>
        <span class="toggle-line"></span>
    </div>
  </div>

  <div class="site-meta">

    <a href="/" class="brand" rel="start">
      <i class="logo-line"></i>
      <p class="site-title">vhuichen</p>
      <i class="logo-line"></i>
    </a>
      <p class="site-subtitle" itemprop="description">记录、分享</p>
  </div>

  <div class="site-nav-right">
    <div class="toggle popup-trigger">
    </div>
  </div>
</div>



<nav class="site-nav">
  <ul class="main-menu menu"><li class="menu-item menu-item-home"><a href="/" rel="section">Home</a></li><li class="menu-item menu-item-archives"><a href="/archives/" rel="section">Archives</a></li><li class="menu-item menu-item-about"><a href="/about/" rel="section">About</a></li>
  </ul>
</nav>




</div>
        
  
  <div class="toggle sidebar-toggle" role="button">
    <span class="toggle-line"></span>
    <span class="toggle-line"></span>
    <span class="toggle-line"></span>
  </div>

  <aside class="sidebar">

    <div class="sidebar-inner sidebar-nav-active sidebar-toc-active">
      <ul class="sidebar-nav">
        <li class="sidebar-nav-toc">
          Table of Contents
        </li>
        <li class="sidebar-nav-overview">
          Overview
        </li>
      </ul>

      <div class="sidebar-panel-container">
        <!--noindex-->
        <div class="post-toc-wrap sidebar-panel">
            <div class="post-toc animated"><ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%88%A4%E6%96%ADView%E6%98%AF%E5%90%A6%E6%98%BE%E7%A4%BA%E5%9C%A8%E5%BD%93%E5%89%8D%E7%AA%97%E5%8F%A3"><span class="nav-number">1.</span> <span class="nav-text">判断View是否显示在当前窗口</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%9D%90%E6%A0%87%E8%BD%AC%E5%8F%98%E6%96%B9%E6%B3%95"><span class="nav-number">2.</span> <span class="nav-text">坐标转变方法</span></a></li></ol></div>
        </div>
        <!--/noindex-->

        <div class="site-overview-wrap sidebar-panel">
          <div class="site-author site-overview-item animated" itemprop="author" itemscope itemtype="http://schema.org/Person">
    <img class="site-author-image" itemprop="image" alt="vhuichen"
      src="/images/vhuichen.jpg">
  <p class="site-author-name" itemprop="name">vhuichen</p>
  <div class="site-description" itemprop="description"></div>
</div>
<div class="site-state-wrap site-overview-item animated">
  <nav class="site-state">
      <div class="site-state-item site-state-posts">
        <a href="/archives/">
          <span class="site-state-item-count">78</span>
          <span class="site-state-item-name">posts</span>
        </a>
      </div>
      <div class="site-state-item site-state-categories">
          <a href="/categories/">
        <span class="site-state-item-count">11</span>
        <span class="site-state-item-name">categories</span></a>
      </div>
      <div class="site-state-item site-state-tags">
          <a href="/tags/">
        <span class="site-state-item-count">86</span>
        <span class="site-state-item-name">tags</span></a>
      </div>
  </nav>
</div>



        </div>
      </div>
    </div>
  </aside>
  <div class="sidebar-dimmer"></div>


    </header>

    
  <div class="back-to-top" role="button" aria-label="Back to top">
    <i class="fa fa-arrow-up"></i>
    <span>0%</span>
  </div>

<noscript>
  <div class="noscript-warning">Theme NexT works best with JavaScript enabled</div>
</noscript>


    <div class="main-inner post posts-expand">


  


<div class="post-block">
  
  

  <article itemscope itemtype="http://schema.org/Article" class="post-content" lang="zh-Hans">
    <link itemprop="mainEntityOfPage" href="https://vhuichen.github.io/2017/07/2017/07/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E5%88%A4%E6%96%ADView%E6%98%AF%E5%90%A6%E6%98%BE%E7%A4%BA%E5%9C%A8%E5%BD%93%E5%89%8D%E7%AA%97%E5%8F%A3/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="image" content="/images/vhuichen.jpg">
      <meta itemprop="name" content="vhuichen">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="vhuichen">
      <meta itemprop="description" content="">
    </span>

    <span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork">
      <meta itemprop="name" content="iOS开发之判断View是否显示在当前窗口 | vhuichen">
      <meta itemprop="description" content="">
    </span>
      <header class="post-header">
        <h1 class="post-title" itemprop="name headline">
          iOS开发之判断View是否显示在当前窗口
        </h1>

        <div class="post-meta-container">
          <div class="post-meta">
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-calendar"></i>
      </span>
      <span class="post-meta-item-text">Posted on</span>

      <time title="Created: 2017-07-11 21:01:43" itemprop="dateCreated datePublished" datetime="2017-07-11T21:01:43+08:00">2017-07-11</time>
    </span>
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-calendar-check"></i>
      </span>
      <span class="post-meta-item-text">Edited on</span>
      <time title="Modified: 2018-07-01 16:07:46" itemprop="dateModified" datetime="2018-07-01T16:07:46+08:00">2018-07-01</time>
    </span>
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-folder"></i>
      </span>
      <span class="post-meta-item-text">In</span>
        <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
          <a href="/categories/iOS%E5%9F%BA%E7%A1%80/" itemprop="url" rel="index"><span itemprop="name">iOS基础</span></a>
        </span>
    </span>

  
</div>

        </div>
      </header>

    
    
    
    <div class="post-body" itemprop="articleBody">
        <h3 id="判断View是否显示在当前窗口"><a href="#判断View是否显示在当前窗口" class="headerlink" title="判断View是否显示在当前窗口"></a>判断View是否显示在当前窗口</h3><p>写一个分类</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#import <span class="string">&lt;UIKit/UIKit.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">@interface</span> <span class="title">UIView</span> (<span class="title">VCHFrame</span>)</span></span><br><span class="line"></span><br><span class="line">- (<span class="type">BOOL</span>)isShowingOnKeyWindow;</span><br><span class="line"></span><br><span class="line"><span class="keyword">@end</span></span><br></pre></td></tr></table></figure>

<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">- (<span class="type">BOOL</span>)isShowingOnKeyWindow &#123;</span><br><span class="line">    <span class="built_in">UIWindow</span> *window = [<span class="built_in">UIApplication</span> sharedApplication].keyWindow;</span><br><span class="line">    <span class="built_in">CGRect</span> newRect = [window convertRect:<span class="keyword">self</span>.frame fromView:<span class="keyword">self</span>.superview];</span><br><span class="line">    <span class="type">BOOL</span> intersects = <span class="built_in">CGRectIntersectsRect</span>(newRect, window.bounds);</span><br><span class="line">    <span class="keyword">return</span> intersects &amp;&amp; !<span class="keyword">self</span>.isHidden &amp;&amp; (<span class="keyword">self</span>.alpha &gt; <span class="number">0.01</span>) &amp;&amp; (<span class="keyword">self</span>.window == window);</span><br><span class="line">&#125;</span><br><span class="line">~~~   </span><br><span class="line"></span><br><span class="line">### 判断控制器是否显示到当前窗口   </span><br><span class="line">可以用一种简单的方法，判断view是否已经加载，再判断window是否存在。用这两个条件正常情况下都可以判断出来。   </span><br><span class="line">**这种方法不是绝对的。**</span><br><span class="line"></span><br><span class="line">~~~ objc</span><br><span class="line">- (<span class="type">BOOL</span>)isShowing &#123;</span><br><span class="line">	<span class="keyword">return</span> <span class="keyword">self</span>.isViewLoaded &amp;&amp; <span class="keyword">self</span>.view.window;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="坐标转变方法"><a href="#坐标转变方法" class="headerlink" title="坐标转变方法"></a>坐标转变方法</h3><pre><code class="objc">CGRect newRect = [view1 convertRect:view2.frame toView:view3];
CGRect newRect = [view3 convertRect:view2.frame fromView:view1];
</code></pre>
<p>view1：view2的父类（view2的frame相对的坐标系的view）<br>view2：需要转换坐标的view<br>view3：转换后坐标所在的view   </p>

    </div>

    
    
    

    <footer class="post-footer">
          <div class="post-tags">
              <a href="/tags/View/" rel="tag"># View</a>
          </div>

        

          <div class="post-nav">
            <div class="post-nav-item">
                <a href="/2017/06/2017/06/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E4%B8%8A%E4%BC%A0%E4%BB%A3%E7%A0%81%E5%88%B0CocoaPods/" rel="prev" title="iOS开发之上传代码到CocoaPods">
                  <i class="fa fa-chevron-left"></i> iOS开发之上传代码到CocoaPods
                </a>
            </div>
            <div class="post-nav-item">
                <a href="/2017/11/2017/11/iOS%E5%BC%80%E5%8F%91%E4%B9%8B%E4%BD%BF%E7%94%A8SVN%E7%AE%A1%E7%90%86%E4%BB%A3%E7%A0%81(Cornerstone)/" rel="next" title="iOS开发之使用SVN管理代码(Cornerstone)">
                  iOS开发之使用SVN管理代码(Cornerstone) <i class="fa fa-chevron-right"></i>
                </a>
            </div>
          </div>
    </footer>
  </article>
</div>






</div>
  </main>

  <footer class="footer">
    <div class="footer-inner">


<div class="copyright">
  &copy; 2015 – 
  <span itemprop="copyrightYear">2022</span>
  <span class="with-love">
    <i class="fa fa-heart"></i>
  </span>
  <span class="author" itemprop="copyrightHolder">vhuichen</span>
</div>
  <div class="powered-by">Powered by <a href="https://hexo.io/" rel="noopener" target="_blank">Hexo</a> & <a href="https://theme-next.js.org/pisces/" rel="noopener" target="_blank">NexT.Pisces</a>
  </div>

    </div>
  </footer>

  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/3.2.1/anime.min.js" integrity="sha256-XL2inqUJaslATFnHdJOi9GfQ60on8Wx1C2H8DYiN1xY=" crossorigin="anonymous"></script>
<script src="/js/comments.js"></script><script src="/js/utils.js"></script><script src="/js/motion.js"></script><script src="/js/next-boot.js"></script>

  





  





</body>
</html>
